CN1148172A - Calibration method for NDIR equipment and calibration apparatus - Google Patents
Calibration method for NDIR equipment and calibration apparatus Download PDFInfo
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- CN1148172A CN1148172A CN96106010.7A CN96106010A CN1148172A CN 1148172 A CN1148172 A CN 1148172A CN 96106010 A CN96106010 A CN 96106010A CN 1148172 A CN1148172 A CN 1148172A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000001745 non-dispersive infrared spectroscopy Methods 0.000 title claims abstract 9
- 238000005259 measurement Methods 0.000 claims abstract description 41
- 230000007246 mechanism Effects 0.000 claims description 17
- 230000007613 environmental effect Effects 0.000 claims description 6
- 239000008246 gaseous mixture Substances 0.000 claims 2
- 239000012080 ambient air Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 35
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 238000009434 installation Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 101000793686 Homo sapiens Azurocidin Proteins 0.000 description 1
- 240000000233 Melia azedarach Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
- G01N21/274—Calibration, base line adjustment, drift correction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Immunology (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Theoretical Computer Science (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Abstract
The invention relates to a method and apparatus for calibrating an NDIR gas analyzer. According to the method, the apparatus (1) under calibration is calibrated with the help of a reference apparatus (2) under controlled conditions. According to the invention, the reference apparatus (2) is a laboratory-calibrated NDIR measurement apparatus in an arrangement based on circulating the ambient air via both the measurement chamber (6) of the measurement apparatus (1) under calibration and the measurement chamber (16) of the laboratory-calibrated measurement apparatus (2) and adjusting the reading of the display (23), or alternatively, the output signal of the measurement apparatus under calibration equal to the reading of the display (22), or the output signal, respectively, of the reference apparatus (2).
Description
The present invention relates to a kind of described calibration steps of aforementioned part according to claim 1.
The invention still further relates to a kind of calibrating installation.
In the common structure that adopts of more low-grade NDIR (Non-Dispersive Infrared) (NDIR) measuring equipment, the time limit that uses along with equipment strengthens, and output signal presents drift trend.In such as patent documentations such as Japanese publication 59-173734, understand the technology of this class NDRI equipment in detail.Conventional measuring equipment often need move on to the laboratory and carry out calibration operation, and Measuring Object is in uncontrolled state during calibration operation.Such laboratory calibration is an expensive time-consuming job again, and must just repeat so that equipment keeps required measuring accuracy by every interval certain hour.The problems referred to above are frustrating especially in monitor the such air-conditioning equipment of gas concentration lwevel in the recyclegas with NDIR equipment the time because this moment measuring equipment signal drift influenced the performance of air-conditioning system.
An object of the present invention is to overcome the shortcoming of above-mentioned technology, and obtain a kind of brand-new calibration steps and device.
The present invention is based on NDRI equipment is calibrated, the mode of calibration is that NDRI equipment of calibrating in the laboratory and equipment to be calibrated are placed side by side, ambient gas is circulated, the gas of the equipment to be calibrated of flowing through is entered in the sample cavity of the reference measure equipment of being crossed by calibration in advance under laboratory condition subsequently.
More particularly, the inventive method is characterised in that the characteristic of claim 1.
In addition, apparatus of the present invention are characterised in that the characteristic of claim 5.
Effect of the present invention is remarkable.Use when of the present invention, no longer need independent calibration gas potpourri in the calibration process on the scene or carry out the laboratory calibration of relevant temperature, pressure Lian.The independent calibration gas potpourri of this class costs an arm and a leg, and is difficult to use.In addition, if conventional calibration process take be common field calibration mode the time, as ignored the pressure and temperature compensation, then can bring excessive uncertain factor.Method of the present invention has realized simply, the quick and cheap field calibration of expense, and measuring equipment does not originally need to remove from control system in calibration process yet.
Below, will do more detailed analysis by means of some typical embodiment to the present invention with reference to the accompanying drawings.
Fig. 1 is the synoptic diagram of calibrating installation of the present invention.
Fig. 2 is the synoptic diagram of the another kind of calibrating installation of the present invention.
Fig. 3 is the typical output voltage of NDIR equipment-concentration curve family figure.
Fig. 4 is the synoptic diagram of the calibrating installation of routine.
Fig. 5 is the synoptic diagram of calibrating installation of the present invention.
Referring to Fig. 1, a kind of calibrating installation of the present invention mainly comprises four parts, i.e. the electronics part 20 of NDIR measurement mechanism 1 to be calibrated, another NDIR measurement mechanism 2 of calibrating in the laboratory, device electronics part 21 to be calibrated and a reference unit.In the present invention, the laboratory is calibrated a speech and is referred to adopt at least two kinds of concentration and different calibration gas potpourri of knowing different with component in the demonstration reading of known temperature and the following measurement mechanism of pressure or the process that output signal is adjusted to right value.Carbon dioxide is measured, and used typical calibration gas potpourri comprises nitrogen, comes the zero point of apparatus for establishing with it, and another concentration point simultaneously to be calibrated is the upper limit of measurement range (as carbon dioxide is 2000ppm) normally.
Usually, the NDIR measurement mechanism comprises that one is suitable for measuring the light source 3 that infrared radiation is sent in chamber 6 to one.Filter the described radiation of measuring the chamber of passing with a bandpass filter 5, and detect described radiation with detecting device 4.The unit of being made up of light source 3, measurement chamber 6, bandpass filter 5 and detector 4 is also referred to as optical correction's platform.The measurement result that obtains is thus handled in an electronics unit 21, and the words that the output signal in the described unit 21 is proportional to gas concentration and needs also can be expressed as the gas concentration reading on display 23.Among the embodiment that illustrates in the drawings, gas flows to and measures chamber 6 by means of the bypass flow line 9 that flows through that heating causes, described bypass flow line 9 links to each other with the optical correction platform by inlet tube 11 and outlet 8.This shunt valve has a ventilative pipeline portions 10, and gas to be measured is exactly to enter into the gas circulation of device by this part from measurement mechanism ambient atmosphere on every side, and then enters in the measurement chamber 6.In the device of a low grade, such gas circulation is to be flowed by the thermic due to 3 liberated heats of light source to realize.Independent pump also can be used for making gas circulation.
According to the present invention, measurement mechanism to be calibrated has one second outlet 25, and this pipe links to each other with optical correction's platform of reference unit 2 by a flexible pipe 17.Reference unit 2 demonstrates correct concentration readings through pre-calibration on the display 22 at reference unit under laboratory condition.1 similar to device, reference unit comprise a light source 13, measure chamber 16, bandpass filter 15 and detecting device 14, detecting device 14 links to each other with an electronics unit 20, the output signal of unit 20 is removed delivers to gas concentration display 22.Be suitable for gas from around the ambient atmosphere suction tube 29 that pumps into reference unit 1 be connected to the outlet of reference unit 2, perhaps on the inlet tube, like this, supply with basically the environmental gas potpourri identical with reference unit 2 to the measurement chamber 16 of reference unit 2.Must guarantee temperature substantially constant in correction measurement process of gas, this will rely on the limited length owing to gas flow channel to make measurement be kept invariable for a long time.In addition, can also use different gas concentrations in correcting measuring, condition is that the response time in two measurement chambeies is identical with electronic unit and flow velocity is known.Then, by means of the comparison of for example being finished these measured values by the method for known delay in flow correction reading, perhaps the method for using a computer will be carried out the optimization match to measuring curve.
In calibration process, relatively electronic installation 20 and 21 demonstration reading or output signal relatively after, utilize correcting controller 24 that the reading of display 23 or the output signal that is in reference unit 1 under the correcting state are adjusted to the reading that equals display 22 or the output signal of reference unit 2 respectively.Controller calibration 24 for example can be a potential difference meter in the electronics unit 21 in the reality.Another kind of scheme is, calibration operation can carry out automatically, the electronic unit 21 that is in the device 1 under the correcting state like this has a connector owing to the signal of reference unit 2, and correction signal is transported to electronic unit 21 by reference unit 20 under the control of sequencer.
The system of the invention described above is applicable to the calibration of single-point concentration.Simple 2 calibrating installations of another one also can be used on herein, and these need charge into the rough known reference gas mixture of a kind of concentration in the connector 26 (or T shape connector 36 of flexible pipe 17) of device 1.For carbon dioxide, such reference gas can be with providing such as following method: be blown into a certain amount of breath in a balloon or similar containers, discharge gas or other from the gas that contains excess carbon dioxide that burner is discharged, charge into atmosphere with air pump in the residual volume of balloon then.To measuring chamber 6 venting, the pump on the calibration console pumps into gas in the measurement chamber 16 of reference unit 2 completely charged like this balloon thus through connector 26.Usually cover calibration with an airtight over cap 27 and go into opening connector 26.Correspondingly, cover T shape with a similar over cap 37 and connect 36.
Pump 10 is a suction pump routinely, and uses the technology of the pump formation overvoltage of positive pressure head also to be considered to be in the scope of the present invention.
Referring to Fig. 2, NDIR measurement mechanism to be calibrated can be furnished with a rectangular mobile slit 35 with a diffusion pass filter, and the by-pass flow path shown in Fig. 1 is just unnecessary like this.
Referring to Fig. 3, there is shown the detector output signal of a desirable NDIR measurement mechanism and the correlativity of gas concentration.Among the figure, Z-axis is the detecting device output voltage, and transverse axis is represented gas concentration.The calibration curve of output that device 2 shown in solid line 31 presentation graphs 1 is depressed at three varying environment temperature or atmosphere 1.Corresponding curve of output when dot-and-dash line 30 indication devices 1 are calibrated under three varying environment conditions.When calibrating according to the present invention, can suppose that gas concentration gets for example level shown in the line 32, and temperature is T2, two pressure of measuring in the chamber are equal substantially.In the calibration process, gas concentration needn't accurately know, makes that gas concentration equates in device 1 and 2 but will satisfy.When pump 19 sucked environmental gas through reference unit 2 in Fig. 1, the reading in the display 22 and 23 should equate.Under afore-mentioned, the line shown in 34 equates among output potential difference and the figure.By regulating potential difference meter 24 or carrying the modifying factor of digital form to revise the error of output voltage, be that so a kind of facility is finished in the NDIR device.Correspondingly, can adopt " balloon technology " (balloon technique) to carry out 2 calibrations in the above described manner, obtain another kind of reference gas concentration 33 with this technology, simultaneously the slope T2 of the device curve of output that can cross according to calibration in advance proofreaies and correct the slope of the curve of output of the measurement mechanism 1 in the calibration.If necessary, can with any improved or atmospheric pressure under be full of reference gas other container replace the balloon technology, at this moment can make gas flow with an electrodynamic pump or manpower pump.
Referring to Fig. 4, according to the technology of routine, must be when five NDIR measurement mechanisms 44 are calibrated to the parameter of each measurement mechanism input concentration knows under the books temperature and pressure two reference gas mixture 40 and 42.Because so unique extremely difficult knowing of condition must just can be carried out in laboratory or service station when calibrating with prior art usually under field condition.
Except carbon dioxide, calibrating installation of the present invention also can be applicable to the measurement of absolute humidity measurement and carbonomonoxide concentration, hydrocarbon (as methane or ethene) and nitrous oxide concentration.
Claims (7)
1, a kind of calibration steps that is used for NDIR gas analyzer (1), according to this method, a reference unit (2) that wherein is in device (1) under the align mode and is by means of slave mode is calibrated, it is characterized in that reference unit (2) is the NDIR measurement mechanism that was subjected to the laboratory calibration according to a scheme based on following steps, this testing program comprises makes the measurement chamber (6) of surrounding air by being in the measurement mechanism (1) under the align mode and measurement chamber (16) circulation of the measurement mechanism (2) calibrated in the laboratory, and the reading person of changing who regulates display (23) output signal that is in the measurement mechanism under the align mode equals the reading of display (22) respectively or equals the output signal of reference unit (2).
2, a kind of the method for claim 1 is characterized in that and will deliver to the measurement chamber (16) of reference unit (2) by a suction pump (19) from the measurement chamber (6) of measurement mechanism to be calibrated (1) as the environmental gas of calibration gas potpourri.
3, the gaseous mixture that provides a kind of concentration to be different from environmental gas by to a container is provided a kind of the method for claim 1, sends into this potpourri and obtains one second calibration point to device to be calibrated (1) then.
4, a kind of as the described method of any one claim of front, be used to measure two gas concentration lwevels, it is characterized in that by a kind of gaseous mixture of being made up of breath or environmental gas being provided to a container and sending into this potpourri, and obtain one second calibration point to device to be calibrated (1).
5, a kind of device that is used to calibrate the NDIR gas analyzer, described device comprises a reference unit (2) that is used to calibrate device to be calibrated (1), it is held to levy and is that described reference unit (2) is the NDIR measurement mechanism that calibrated in a laboratory, comprises that the measurement chamber (16) of measurement chamber (6) by device to be calibrated (1) and reference unit (2) transmits the device (19) of environmental gas.
6, a kind of device that is used to calibrate the NDIR gas analyzer as claimed in claim 5 is characterized in that described reference unit (2) comprises the device of difference between the measurement result that directly obtains reference unit (2) and device (1) to be calibrated.
7, a kind of as claim 5 or the 6 described devices that are used to calibrate the NDIR gas analyzer, it is characterized in that described reference unit (2) comprises and be used for and will directly deliver to the device of device to be calibrated (1) based on the correction factor of described different signal under processor control.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI951339A FI100827B (en) | 1995-03-22 | 1995-03-22 | Method for calibrating an NDIR device and calibration device |
| FI951339 | 1995-03-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1148172A true CN1148172A (en) | 1997-04-23 |
| CN1099029C CN1099029C (en) | 2003-01-15 |
Family
ID=8543098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96106010.7A Expired - Fee Related CN1099029C (en) | 1995-03-22 | 1996-03-22 | Calibration method for NDIR equipment and calibration apparatus |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5850354A (en) |
| EP (1) | EP0733897B1 (en) |
| JP (1) | JPH08271415A (en) |
| CN (1) | CN1099029C (en) |
| AU (1) | AU705958B2 (en) |
| DE (1) | DE69626056T2 (en) |
| FI (1) | FI100827B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101349620B (en) * | 2007-07-20 | 2012-11-07 | 霍尼韦尔国际公司 | Gas sensor test and calibration system |
| CN103175803A (en) * | 2011-12-26 | 2013-06-26 | 上海仪华仪器有限公司 | Self-correction method for detecting carbon dioxide concentration by adopting non-dispersive infrared technology |
| CN103328954A (en) * | 2010-11-01 | 2013-09-25 | 气体敏感液有限公司 | Temperature calibration methods and apparatus for optical absorption gas sensors, and optical absorption gas sensors thereby calibrated |
| CN104198425A (en) * | 2014-09-22 | 2014-12-10 | 合肥工业大学 | Temperature and air pressure characteristic test system for non-dispersive infrared gas sensor |
| CN106062535A (en) * | 2014-03-13 | 2016-10-26 | 罗伯特·博世有限公司 | Method and device for determining the carbon dioxide content in ambient air |
| CN106248584A (en) * | 2016-06-29 | 2016-12-21 | 深圳市怀睿科技有限公司 | A kind of method and system improving gas concentration accuracy of detection |
| CN107085117A (en) * | 2015-10-09 | 2017-08-22 | 恩德莱斯和豪瑟尔分析仪表两合公司 | Measurement apparatus |
| CN107328730A (en) * | 2017-07-05 | 2017-11-07 | 中电科技集团重庆声光电有限公司 | Complete or collected works' accepted way of doing sth infrared gas sensor and its method of work |
| CN108169147A (en) * | 2016-12-06 | 2018-06-15 | 恩德莱斯和豪瑟尔分析仪表两合公司 | For adjusting the method for measuring apparatus |
| CN113702600A (en) * | 2021-09-27 | 2021-11-26 | 北京伟瑞迪科技有限公司 | Environmental analyzer calibration apparatus and method |
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| US6751576B2 (en) | 2000-03-10 | 2004-06-15 | Cognis Corporation | On-site agricultural product analysis system and method of analyzing |
| US20030135547A1 (en) | 2001-07-23 | 2003-07-17 | Kent J. Thomas | Extensible modular communication executive with active message queue and intelligent message pre-validation |
| US7034304B2 (en) * | 2003-07-25 | 2006-04-25 | Honeywell International, Inc. | Chamber for gas detector |
| SE0402047D0 (en) * | 2004-08-18 | 2004-08-18 | Foss Analytical Ab | Measurement system |
| GB0705356D0 (en) | 2007-03-21 | 2007-04-25 | Alphasense Ltd | Optical absorption gas sensor |
| US8148691B1 (en) * | 2009-08-21 | 2012-04-03 | Jacob Y Wong | Calibration methodology for NDIR dew point sensors |
| WO2012126469A1 (en) * | 2011-03-23 | 2012-09-27 | Danfoss Ixa A/S | Gas sensor with vortex |
| JP5794803B2 (en) * | 2011-03-28 | 2015-10-14 | 株式会社堀場エステック | Spectrophotometer and calibration method thereof |
| CA2837588A1 (en) * | 2011-05-31 | 2012-12-06 | Airware, Inc. | Re-calibration of ab ndir gas sensors |
| FI125907B (en) | 2013-09-24 | 2016-03-31 | Vaisala Oyj | Method and apparatus for measuring the concentration of gases dissolved in liquids |
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- 1995-03-22 FI FI951339A patent/FI100827B/en not_active IP Right Cessation
-
1996
- 1996-03-14 AU AU48117/96A patent/AU705958B2/en not_active Ceased
- 1996-03-20 DE DE69626056T patent/DE69626056T2/en not_active Expired - Fee Related
- 1996-03-20 EP EP96660004A patent/EP0733897B1/en not_active Expired - Lifetime
- 1996-03-22 CN CN96106010.7A patent/CN1099029C/en not_active Expired - Fee Related
- 1996-03-22 US US08/620,610 patent/US5850354A/en not_active Expired - Fee Related
- 1996-03-22 JP JP8065689A patent/JPH08271415A/en not_active Abandoned
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| CN101349620B (en) * | 2007-07-20 | 2012-11-07 | 霍尼韦尔国际公司 | Gas sensor test and calibration system |
| CN103328954A (en) * | 2010-11-01 | 2013-09-25 | 气体敏感液有限公司 | Temperature calibration methods and apparatus for optical absorption gas sensors, and optical absorption gas sensors thereby calibrated |
| CN103328954B (en) * | 2010-11-01 | 2016-08-10 | 气体敏感液有限公司 | Optical absorption gas sensor and temperature correction method and apparatus thereof |
| CN103175803A (en) * | 2011-12-26 | 2013-06-26 | 上海仪华仪器有限公司 | Self-correction method for detecting carbon dioxide concentration by adopting non-dispersive infrared technology |
| US10527597B2 (en) | 2014-03-13 | 2020-01-07 | Robert Bosch Gmbh | Method and device for determining the carbon dioxide content in ambient air |
| CN106062535A (en) * | 2014-03-13 | 2016-10-26 | 罗伯特·博世有限公司 | Method and device for determining the carbon dioxide content in ambient air |
| CN104198425A (en) * | 2014-09-22 | 2014-12-10 | 合肥工业大学 | Temperature and air pressure characteristic test system for non-dispersive infrared gas sensor |
| CN107085117A (en) * | 2015-10-09 | 2017-08-22 | 恩德莱斯和豪瑟尔分析仪表两合公司 | Measurement apparatus |
| US10585081B2 (en) | 2015-10-09 | 2020-03-10 | Endress+Hauser Conducta Gmbh+Co. Kg | Measuring device |
| CN106248584A (en) * | 2016-06-29 | 2016-12-21 | 深圳市怀睿科技有限公司 | A kind of method and system improving gas concentration accuracy of detection |
| CN108169147A (en) * | 2016-12-06 | 2018-06-15 | 恩德莱斯和豪瑟尔分析仪表两合公司 | For adjusting the method for measuring apparatus |
| CN108169147B (en) * | 2016-12-06 | 2020-12-11 | 恩德莱斯和豪瑟尔分析仪表两合公司 | Method for adjusting a measuring device |
| CN107328730A (en) * | 2017-07-05 | 2017-11-07 | 中电科技集团重庆声光电有限公司 | Complete or collected works' accepted way of doing sth infrared gas sensor and its method of work |
| CN113702600A (en) * | 2021-09-27 | 2021-11-26 | 北京伟瑞迪科技有限公司 | Environmental analyzer calibration apparatus and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1099029C (en) | 2003-01-15 |
| JPH08271415A (en) | 1996-10-18 |
| AU705958B2 (en) | 1999-06-03 |
| FI951339A0 (en) | 1995-03-22 |
| EP0733897B1 (en) | 2003-02-05 |
| FI100827B (en) | 1998-02-27 |
| AU4811796A (en) | 1996-10-03 |
| US5850354A (en) | 1998-12-15 |
| DE69626056T2 (en) | 2004-01-22 |
| EP0733897A3 (en) | 1997-01-08 |
| EP0733897A2 (en) | 1996-09-25 |
| FI951339A (en) | 1996-09-23 |
| DE69626056D1 (en) | 2003-03-13 |
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